Onychogomphus forcipatus (left) and O. uncatus (right)In O. forcipatus note the yellow bar on the vortex and the two black shoulder stripes which are both connected to the mid-dorsal black stripe.

Onychogomphus forcipatus (left) and O. uncatus (right)In O. uncatus the two black shoulder stripes are typically broad and parallel, while in O. forcipatus these stripes are thinner and wavier, and are both connected to the mid-dorsal black stripe.